In common usage, most people use the word statistic to refer to research figures and calculations, either from information based on a sample or an entire population. Statistics means different things to different people.
The best way to see the Hollywood Sign is to drive up Beachwood Drive (north of Hollywood Boulevard). The Sign is clearly visible most the way up Beachwood, although the hills begin to obscure the view of the Sign near the top of the drive.
Probally can - it mostly depends on how much time you want to spend at Universal Studios(might need a couple days to see everything) and wether you want to shop on Rodeo Dr. or just look around. For the Hollywood sign - I assume you mean you want to hike to it, since it is visible from most places in Los Angeles.